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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786cb179753d9b1c42961e7a705fd08f8ad9e8d4382f72949ccef40e709f6e56' 
  AND token = 'XizMxLzQo1FnBgSjqssYYRCnu1yquEQT5Jg446iTZIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}